Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Apple Jelly
Ingredients
Directions
Prepare the juice
Pare and cut the apples into pieces, removing the cores.
Place the apples in a preserving pan and cover with cold water.
Boil the apples for one hour.
Drain the syrup through a fine sieve or jelly bag.
Measure the juice.
Make the jelly
For every pint of juice, add ¾ pound of loaf sugar.
Boil the juice and sugar together for 45 minutes.
Skim off any scum and stir to prevent burning.
If desired, add a little lemon rind during boiling.
Add strained lemon juice just before finishing.
Store the jelly in small pots.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + sugartop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
Apple and sugar barely smell alike, yet cooks put them together in 16,478 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Apples
- Provide the natural pectin and flavour that set the jelly once their juice is extracted.
- Loaf sugar
- Sweetens the jelly and, with boiling, helps it set to a firm, spreadable texture.
- Lemon juice
- Adds acidity that brightens the flavour and supports pectin setting.
The step that matters
Skim off any scum and stir to prevent burning. Scum rising during boiling can cloud the jelly and spoil its clarity, while sugar-thickened juice sticks and scorches on the base of the pan if not stirred, giving a burnt taste.
Swap the lemon
The recipe marks lemon as optional. How well each one fits the dish's main ingredients (apple, sugar):
- Pearfits better
- Vanillafits better
- Apricotfits better
- Lemonthe original
Fit is the average pairing score against apple, sugar. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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